code: def test_windbarbs_barbcolor(self):
      x = np.linspace(-1, 1, 4)
      X, Y = np.meshgrid(x, x)
      U, V = 10 * X, 6 * Y
  
      angle = np.pi / 2 - np.arctan2(-V, -U)
      mag = np.hypot(U, V)
  
      barbs = gv.WindBarbs((X, Y, angle, mag)).opts(
          colorbar=True, clim=(0, 50), barbcolor="red"
      )
      plot = mpl_renderer.get_plot(barbs)
      artist = plot.handles["artist"]
      np.testing.assert_almost_equal(
          # red (RGBA)
          artist.get_facecolor(),
          np.array([[1.0, 0.0, 0.0, 1.0]]),
      )
      np.testing.assert_almost_equal(
          # red
          artist.get_edgecolor(),
          np.array([[1.0, 0.0, 0.0, 1.0]]),
      )
  
file_path: geoviews/geoviews/tests/plotting/mpl/test_chart.py
imports: import numpy
  import xarray
  import geoviews
  from geoviews.element import WindBarbs
  from holoviews.tests.plotting.utils import ParamLogStream
  from geoviews import Store
  from test_plot import TestMPLPlot
label_desc: Use image node_id 8 for calling the TestWindBarbsPlot obj's underlying member method code with example usage: obj.test_windbarbs_barbcolor() without return types